Switch ICs

USB High-side Switch

There are two main roles of USB. Recently, USB switch IC is used as a load switch with protections.

1. USB power line's ON/OFF control
By the enable signal from another device such as a USB Host Controller, the USB switch turn on the USB power line with suppressing inrush current with soft-start function. On the contrary, by the disable signal, the USB switch cut off the power line with or without auto-discharge function (Option).

2. USB power line protection
There is protection capability against the abnormal heating in the USB switch, and if preset over-current is detected, output current is limited or power is cut off and latched for protection.

*1FLG pin has N-channel open drain output, therefore pull-up resistance is necessary when it is used. The output of FLG pin becomes "L" when the thermal shutdown or over-current limit-function works.

*2According to the USB standard,120µF or more capacitor attachment is recommended, however, as an IC, changing capacitor is acceptable considering other usage.